JPH01306152A - Measuring device for cutting tool - Google Patents

Abstract

PURPOSE:To automatically and accurately provide a measuring value of sizes, e.g. the division angle, the twist angle of the cutting edge of a tool, only by bringing a probe into contact with the portion, intended to be measured, of a cutting tool to be measured. CONSTITUTION:When the division angle of the cutting edge of an end mill 5 is measured, the tip of a probe 6 is brought into contact with the given position of the cutting edge. Through a rotation of the end mill by a slight amount at a time, a position where the detecting value of a direction-Y displacement detector 8 is maximized is detected, and a detecting value from an angle detector 3 in this position is inputted to a computer 9. The division angle of the cutting edge is determined by the computer 9. Further, during measurement of a taper angle and the size of a tip, a side 6b of the probe 6 is brought into contact with the tip of the end mill, and a current detecting value from a direction-X displacement detector 7 is inputted to the computer 9. Under a state in which the tip of the probe 6 is brought into contact with the side of the cutting edge, the end mill is rotated by a slight amount at a time to detect a position where a detecting value from the direction-Y displacement detector 8 is maximized. With this state, based on detecting values from the detectors 7 and 8, the size of a tip and a taper angle are determined by means of the computer 9.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a measuring device for cutting tools, and more specifically, for measuring the division angle, helix angle, Taber angle, tip diameter, tool length, etc. of the blade of an end mill, etc. related to a device for

<Prior art and its problems> Conventionally, an optical microscope has been used to measure the division angle and helix angle of the blade of an end mill, but measurements using this optical microscope have had the following problems.

■When measuring the division angle of the blade, it is measured by looking at the end mill from its axial direction, so for example, in the case of an end mill with a rounded part at the tip as shown in Figure 6, it is very difficult to determine which part is considered the cutting edge. and difficult to measure. In addition, even with end mills that do not have a rounded part at the tip as shown in Figure 7, it takes time to find the center line, so it takes a lot of time to measure, and it is also difficult to find the center line accurately. Errors are likely to occur.

■When measuring the helix angle, as shown in Figure 8, when looking at the end mill from the side, the blade does not form a straight line but draws a gentle curve. It takes a long time to find the tangent line, and the criteria for finding the tangent line are vague, making measurement errors easy.

On the other hand, a projector or tool presetter is used to measure the Taber angle of an end mill. However, when measuring with a projector, the projected image of the side surface of the blade is not a straight line, as shown in Figure 9, so a line along the side surface of the blade is imagined and the Taber angle is measured from that virtual line. There is a problem that the measurement accuracy is poor (and it is very time-consuming).In addition, when measuring with a tool presetter, after the measurement is completed, the measurers have to use the obtained data to calculate the Taber angle. There is a problem in that it requires extra effort in addition to the measurement.

Furthermore, conventionally, calipers, micrometers, projectors, and optical microscopes have been used to measure the tip diameter of end mills. However, when measuring with a caliper or micrometer, the measurement surface must be brought into contact with the very edge of the tip of the end mill, making measurement extremely difficult, especially for end mills with a rounded section at the tip. The problem is that it cannot be measured. On the other hand, when using a projector or an optical microscope, it is possible to measure the diameter of the tip even if there is a radiused portion at the tip, but as shown in Figure 10, the tip must be visualized, which is extremely difficult. The problem remains that it is time-consuming and prone to measurement errors.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems all at once.The structure of the present invention will be explained with reference to FIG. 1 corresponding to an embodiment. , a chuck 21 disposed on the base 1, rotatable around a predetermined direction (X direction) and capable of holding the shank of the cutting tool S to be measured, and an angle detector 3 for detecting the rotation angle of the chuck. and a first movable member on the base 1 in a direction along the rotation axis of the chuck 21.
a table 41, a first displacement detector 7 that detects the amount of displacement of the first table 41, and a first displacement detector 7 that is disposed on the first table and moves in a direction perpendicular to the moving direction of the first table 41. possible second table 51, a second displacement detector 8 for detecting the amount of displacement of the second table 51, and a second table 51.
The measuring stylus 6 is fixed to a table 51 and is positioned corresponding to an arbitrary position of the cutting tool S to be measured, and the detected values of the angle detector 2 and the first and second displacement detectors 7 and 8 are It is characterized by being equipped with a computing unit (computer) 9 that calculates the dimensions of each part of the cutting tool to be measured based on the measurement target.

Function> By simply bringing the measuring stylus 6 into contact with the part of the cutting tool S to be measured that is desired to be measured, the various dimensions of each part of the cutting tool S are automatically calculated by the calculator 9, and the desired measured value can be obtained. I can do it.

That is, when measuring the dividing angle of the end mill blade, first contact the tip of the measuring stylus 6 with point A of the blade, and then turn the end mill S little by little to measure the displacement in the Y direction, as shown in Figure 3. The angle θ at the position where the maximum is the maximum is taken into the calculator 9, and in the same manner, the angles θ8, . θ. and θ. By taking in, the computing unit 9 calculates each angle θ, θ8 . θ0. θ. From, (θ8−
The differences between θA), (θ, -〇〇, etc.) are calculated, and the dividing angle of the blade can be determined from the calculation results.

Also, when measuring the helix angle of an end mill, first
For example, as shown in FIG. 2, the origin of movement of the probe 6 in the Y direction is aligned with the axial center of the end mill S using a reference bar M with a known diameter, and then as shown in FIG. , First, the P of the blade.

Touch the tip of the probe 6 to the point, turn the end mill S little by little, and calculate the angle θ of the position where the displacement in the Y direction is maximum, the position XPI in the X direction, and the amount of displacement r in the Y direction in the calculator 9. Take it in, and then move the probe 6 to
After moving the end mill S in the direction, turn the end mill S to touch the same 22 points of the blade as before, and input the angle θ, 2 and the position x2□ in the X direction into the calculator 9 in the same way as the point P. , the calculation unit 9 calculates β of the following equation from each detected value.
is calculated, and the torsion angle can be determined from the calculated value.

Furthermore, when measuring the taper angle and tip diameter of an end mill, as shown in FIG.
The position XE in the direction is input into the calculator 9.

Next, bring the tip of the measuring stylus 6 into contact with point F of the blade, and take the positions 1xr and yP in the X and Y directions at this time.Next, bring the tip of the measuring stylus 6 into contact with point G of the blade, and take this position. By inputting the position X and yG in the X and Y directions at the time into the calculator 9, the calculator 9 calculates α of the following equation.
and d are calculated, and the taper angle and the tip diameter can be determined from each calculated value.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing the configuration of an embodiment of the present invention.

A chuck unit 2 is fixed on a base 1. Furthermore, the chuck unit 2 includes a chuck part 21 that is rotatable around the X direction, and this chuck part 21 has the following features:
Insert the shank part of the end mill S to be measured into it,
By tightening the knurling part 21a, the end mill S can be held such that its axial center is aligned with the rotation center of the chuck part 21.

Further, a first moving unit 4 is fixed to the base 1. The moving unit 4 includes a moving table 41 that can be moved in the X direction by operating a handle 42. The moving unit 4 is also provided with an X-direction displacement detector 7 such as a linear encoder for detecting the amount of displacement of the moving table 41 in the X-direction.

On the moving table 41 of the first moving unit 4, there is a second moving unit 5. is fixed. The moving unit 5 includes a moving table 51 that can be moved in the Y direction by operating a handle 52.

The moving unit 5 also has a Y
Y-direction displacement detector 8 for detecting displacement in the direction
is provided.

The moving table 51 of the second moving unit 5 has a measuring stylus 6.
is fixed. The tip of the probe 6 has a knife shape, with an edge 6a extending in a direction perpendicular to the X-Y plane, and a left side surface 6b extending in the Y direction. Furthermore, the position of the probe 6 in the direction orthogonal to the X-Y plane is such that the center of the edge 6a coincides with the center of rotation of the chuck portion 21 of the chuck unit 2.

In the above configuration, a computer 9 is connected to the angle detector 3 and the two displacement detectors 7.8.

The computer 9 is equipped with a CPU, ROM, RAM, keyboard, etc., and each detector 3 can be controlled by keyboard operation.
．． 7. To store the detected values from 8 in the RAM and calculate various dimensions such as the division angle, helix angle, taper angle, or tip diameter of the blade of the end mill S, which will be described later, based on each detected value. Multiple calculation modes are set. Further, a desired one of the plurality of calculation modes can be appropriately selected by keyboard operation.

The calculation results of the computer 9 are displayed on the display 10,
Further, the detection value of the Y-direction displacement detector 8 is also displayed on the display 10 via the computer 9 at any time.

Next, the measurement procedure will be explained with reference to FIGS. 2 to 5.

First, as shown in FIG. 2, a reference bar M having a cylindrical shape with a known outer diameter is attached to the chuck unit 2, and the radius R of the reference bar M is input into the computer 9 by operating the keyboard.

Next, the measuring stylus 6 is brought into contact with the side surface of the reference bar M, and the position of the second moving table 51 in the X direction at this time is recognized by the combiator 9. That is, the computer 9 resets the detected value of the X-direction displacement detector 8 and changes the value to the previously input R, thereby checking the zero point of the measuring stylus 6 in the X direction. The center of rotation of the portion 21 can be made to coincide with the center of rotation of the portion 21.

After making such adjustments, remove the reference bar M,
After attaching the end mill S to the chuck portion 21, the following measurements are performed. Note that, before each measurement, the calculation mode necessary for the measurement is set in the computer 9.

Now, to measure the division angle of the blade, as shown in FIG.
Turn the end mill S slightly by hand both clockwise and counterclockwise to find the position where the detected value of the X-direction displacement detector 8 is maximum, and detect the detected value θ of the angle detector 3 at that position,
into the computer 9, and in the same manner,
As shown in FIG. 2 (II), the detected values θB, θC, and θD by the angle detector 3 at points B, C, and D of the other three blades are input into the computer 9. As a result, the computer 9 detects each detected angle θ, , θ8 . θ6. θ. The respective differences, (θ, -θA), (θC - θ, ), (θD
-θC) and (360-(θ.-θA)), that is, the dividing angle of the blade, are calculated, and the calculated values are displayed.

In addition, to measure the torsion angle, as shown in FIG. The position where the value is maximum is found, and the detected values XPI and r of the X and X-direction displacement detectors 7 and 8 and the detected values θ, 1 of the angle detector 3 in this state are input into the computer 9. Next, after moving the measuring head 6 in the X direction,
Rotate the end mill S by hand to touch the same 22 points on the blade as before, and in the same way as point P, record the detected values XPZ and θ, 2 of the X-direction displacement detector 7 and angle detector 3 into the computer 9. Incorporate. In the computer 9, these collected detection values xP I r xP Z + and θPI
The torsion angle β of Equation 11 above is calculated from +θ2□ and r, and the calculated value is displayed.

Furthermore, to measure the taper angle and tip diameter, as shown in FIG. The value X is stored in the computer 9. Next, with the tip of the probe 6 in contact with point F on the side of the blade, turn the end mill S little by little to find the position where the detected value of the X-direction displacement detector 8 is maximum, and in this state. Detected values x and y of X and X direction displacement detectors 7 and 8
F is input into the computer 9, and then, in the same manner, the detection values X and yG of the displacement detectors 7 and 8 at the G point of the blade are input. In the computer 9, these collected detection values X and XFI)'F, and Xa*
)'G to calculate the tip diameter d and taper angle α of the above equations (2) and (3), and the calculation results are displayed.

In the above description, the end mill S is rotated by hand, but the chuck unit 2 may be provided with a mechanism for mechanically or electrically rotating the chuck portion 21.

In addition, although the example of measuring the dimensions of each part of an end mill has been described above, the present invention can be applied to, for example, a drill or a reamer, etc.
Needless to say, this method can also be used to measure other cutting tools.

<Effects of the Invention> As explained above, according to the present invention, the division angle and helix angle of the blade of the end mill can be determined by simply bringing the probe into contact with the part to be measured of the cutting tool to be measured, such as an end mill. Measurements of dimensions such as , taper angle, tip diameter, and tool length can be automatically obtained. Therefore, the measurers can easily and quickly obtain desired measured values without having to set tangents or virtual lines or calculate measured values, which were previously required. , there is no risk that each measurement value will vary, and accurate measurement values can always be obtained.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the configuration of an embodiment of the present invention, Figures 2 to 5 are diagrams for explaining the measurement procedure, and Figures 6 to 10 are diagrams for explaining the problems of the conventional technology. It is a diagram. 1...Base 21...Chuck part 3...Angle detector 41.41...Moving table 6...Measuring element 7...X direction displacement detector 8...Y direction displacement detector 9...Computer patent applicant Sharp Corporation Sharp Seiki Co., Ltd.

Claims (1)

[Claims] a chuck disposed on a base, rotatable about a predetermined direction as an axis, and capable of holding the shank of a cutting tool to be measured; an angle detector for detecting the rotation angle of the chuck; a first table movable in a direction along the rotation axis of the first table; a first displacement detector that detects the amount of displacement of the first table; a second table movable in a direction perpendicular to the moving direction of the table; a second displacement detector for detecting the amount of displacement of the second table; and a cutting tool to be measured, which is fixed to the second table. a measuring element positioned corresponding to an arbitrary position, and a computing unit that computes the dimensions of each part of the cutting tool to be measured based on the detected values of the angle detector and the first and second displacement detectors. Measuring device for cutting tools.